Joseph sack



(No Model.)

J. SAC-K.

TELEPHONE SWITCH.

N0.416,754. PatentedDemlO, 1889.

N. PETERS PMiwLiihugnphlr, Wnhhiiolu D- C.

t, and lever c.

UNITED STATES PATENT OFFICE.

- .I OSEPI[ SACK, OF DUSSELDORF, GERMANY.

TELEPHONE-SWITCH.

SPECIFICATION forming part of Letters Patent No. 416,754, dated December 10, 1889.

Application filed January 4, 1889. $en'al No. 295,418. (No model.) Patented in Germany June 10, 1887-, No. 42,899.

To all whmn it nuty concern:

Be it known that I, JOSEPH SACK, a subject of the German Emperor, residing at Dusseldorf, Germany, have invented certain new and useful Improvements in Telephone- Switches, (forwhich I have obtained apatent in Germany, No 42,899, dated June 10, 1887,) of which the following is a specification.

This invention relates to a switch by which the connection between intermediate stations that had been interrupted for the transmission of a message may be re-established, so that the intermediate stations maybe separately called up.

' The invention consists in the various features of improvement more fully pointed out in the claims.

In the accompanying drawings, Figure 1 is a vertical longitudinal section of my improved switch 011 line 50 51:, Fig. 3. Fig. 2 is a vertical transverse section on line y y, Fig. 3,with lever a swung aside. Fig. 3 is a top view of the switch. Fig. 4 is a plan of the circuit.

d cl are a pair of metal plates provided with the conducting-wires Z Z. In contact with these plates there are a pair of levers b b, turning on pivots b and drawn by springs 19 againstposts g g. The posts g g are connected with a circuit containing an alarm. If the levers b bare in contact with the posts 9 g, the circuit through the wires 1 Z is established; but the circuit can be interrupted by a lever a, that is free to be oscillated laterally around its pivot. The lever 12 or lever 19 may, by pin a on lever a, be pressed away from the post g or g. This pin is not in contact with thelevers while lever a is in its central position. If the lever a is swung to the left, the pin a slides on lever 12 until spring f forms metallic contact with pin-g. By this motion the lever a is placed against the stop 6 and the lever Z) is separated from the contact g. Metallic contact is thus established between lever 9 and arm a and between pin g, spring f, pins 6 c, and lever o The intermediate call-room is placed into the end position. The wire Z is connected with the telephone-circuit by plate d, lever 12, lever a, key The wire Z is connected with the alarm-circuit by plate (1', lever 12', pin g, call-bell IV, galvanoscope G, contact-pin g,

by a pair of springs ff.

spring f, pins 6 c, lever a wire Z and the earth.

The lever a is held in its normal position To look the lever when swung aside in its lateral position until the completion of the message, I make use of the following arrangement:

c is the lever carrying the telephone. This lever is pivoted at c, and is hook-shaped at its front end h, for holding the instrument. The instrument when upon the hook draws the lever 0 down at its forward end. As soon,

however, as the telephoneis taken 01?, the rear end of the lever descends. This will cause a conical stop i on the front half of lever c to be thrown upward and against theside of lever a. In this way the lever a will be locked in place. After the telephone has been replaced upon the hook the lever 0 will swing 011 its pivot and the stop 1' will be drawn down beneath the lower face of lever a, thus liberating the same. The spring f or f will now be free to swing lever a, back into its central posit-ion. The lever a is of course turned to that side at which the conversation is to be carried on. If desired, a galvanoscope may be applied. to indicate from which side the call is received. If the conversation is carried on at one side, the other conducting branch is connected with an alarm, to indieats a call received during the conversation from the other side. If, for example, the lever a is turned to the left,'the spring f will come into contact wit-h the post 9, to connect the right side with the alarm. Both posts 9 g are connected by a wire, to which thealarm is connected. By the contact of spring f with the post gthe current goes to the earth, as both springs ff are connected to a wire that leads to the earth. If a current is sent from the right side it will runthrough post g alarm, post g, spring f, to the earth. If spring f were not in contact with post g, the connection with the earth would be broken, and no call could be transmitted.

The lever a can, if desired, be provided with a small rearward extension or auxiliary lever a Fig. 4, moving between a pair of stopse e. These stops are electrically connected with the springs ff and with one another, while the lever a is connected with the earth. If the lever a is turned to the left, the lever a will make contact with stop a, and the alarm-current will travel (instead of going'from the spring directly to the earth) 5 through stop 6 to e and through lever a to the earth. The lever a is of course insulated from lever a.

The stop *6 011 lever c is made tapering, so that the springs f f and the lever a may lay IO close against their posts or stops.

The circuit is shown in Fig. 4. The posts g g connect with galvanoscope G and with the call-bell Y. The lever a connects with the key 25, the contact 13 of which connects 15 with lever c 'and the contact 25 with battery B. The springs ff are connected with the stops 6 e, the latter with each other. The extension a leads by wire Z to the earth.

2. The combination of lever a with plates d d, levers b 1), posts 9 g, springs b and with the levers a 0, stop "t, and springs f f substantially as specified.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

JOSEPH SACK.

Witnesses:

HERMANN CATHREIN, WILHELM CAMMRATH. 

